DIN EN 16279:2012-09

This European Standard specifies an Ion-Selective Electrode method (ISE) after hydrochloric acid treatment for the determination of fluoride from animal feeding stuffs. The content of fluoride corresponds to that of fluorine specified in Commission Regulation (EU) 574/2011. The method was successfully tested in an interlaboratory study in concentrations between 100 mg/kg up to 500 mg/kg. If this method is followed strictly, then theoretically all concentrations from 40 mg/kg up to 4000 mg/kg can be analysed within the linear calibration function. Only for concentrations lower than 40 mg/kg is the use of an interpolation technique required instead of standard addition Annex C. The quantification limit for fluoride using the conventions of the method including the standard addition technique is 40 mg/kg or lower than 2,5 mg/kg when using interpolation Annex C.